US4645653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for dry flue gas desulfurization incorporating nitrogen oxides removal
Assignee: Marsulex Environmental Technologies LLC
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Filing: 1985-11-29
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Granted: 1987-02-24
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Expires: 2005-11-29
Abstract
Abstract Dry recycle sorbent from a spray dry flue gas desulfurization system is fed into flue gas ducting upstream from a spray absorber to remove NO from the flue gas stream. The high temperature and high SO 2 content of the flue gas upstream of the absorber enhance NO removal rates.
Inventors
- 👤 Shiro G. Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:06
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/60; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
A process of removing nitrogen oxides and sulfur oxides from flue gas in a dry flue gas desulfurization process comprising the steps of: contacting flue gas from a boiler with a dry alkaline powder prior to the flue gas entering a spray absorber; to remove nitrogen oxides removing sulfur oxides from the flue gas stream containing the dry alkaline powder in a spray absorber; collecting dry particulate from the spray absorber; and directing the flue gas stream from the spray absorber through a particulate collector to remove the residual particulate.
Claim 2
Dependent Claim
90 words
A process of removing nitrogen oxides and sulfur oxides from flue gas in a dry flue gas desulfurization process comprising the steps of: contacting flue gas from a boiler with a dry alkaline powder prior to the flue gas entering a spray absorber; to remove nitrogen oxides removing sulfur oxides from the flue gas stream containing the dry alkaline powder in a spray absorber; collecting dry particulate from the spray absorber; and directing the flue gas stream from the spray absorber through a particulate collector to remove the residual particulate.
Claim 3
Dependent Claim
11 words
The process in claim 1 wherein the alkali power comprises lime.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein the dry alkali power comprises dry particulate collected by the particulate collector.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein the dry alkali reagent comprises dry particulate collected from the spray absorber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |